Added Pull Request template file

Adding in a pull request template so we make sure we have covered/thought about all that is needed when creating a PR.

.github/PULL_REQUEST_TEMPLATE.md

+### Purpose of this PR
+Why is this PR needed, what hard problem is it solving/fixing?
+
+---
+### Release Notes
+Please add any useful notes about the feature/fix that might be helpful for others.
+
+---
+### Testing status
+**Katana Tests**: First off we need to make sure the Katana SRP tests are green?
+
+**Manual Tests**: What did you do?
+
+**Automated Tests**: What did you setup?
+
+Any test projects to go with this to help reviewers?
+
+---
+### Overall Product Risks
+**Technical Risk**: None, Low, Medium, High?
+
+**Halo Effect**: None, Low, Medium, High?
+
+---
+### Comments to reviewers
+Notes for the reviewers you have assigned.